package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //只能查询自己购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断当前商品是否在购物车里面
        List<ShoppingCart> shoppingCartList=shoppingCartMapper.list(shoppingCart);
        if(shoppingCartList!=null&&shoppingCartList.size()==1){
            //如果已经存在，则更新数量，数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果不存在，则插入一条数据，数量为1
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                Dish dish=dishMapper.getById(dishId);
                //添加到购物车的是菜品
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //添加到购物车的是套餐
                Setmeal setmeal=setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }
    /*
    * 查看购物车
    * @return
    * */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        List<ShoppingCart> list=shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
        return list;
    }
    /**
     * 清空购物车
     * @return
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }
    /**
     * 删除购物车里的一个商品
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list!=null&&list.size()>0){
            ShoppingCart shoppingCart1=list.get(0);
            Long id = shoppingCart1.getId();
            if(shoppingCart1.getNumber()==1){
                shoppingCartMapper.delete(id);
            }else {
                shoppingCart1.setNumber(shoppingCart1.getNumber()-1);
                shoppingCartMapper.updateNumberById(shoppingCart1);
            }
        }

    }

}
